CIT-1: A New Molecular Sieve with Intersecting Pores Bounded by 10- and 12-Rings

Lobo, Raúl F.; Davis, Mark E.

doi:10.1021/ja00118a013

Cited by 142 publications

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“…[17] 4) Multidimensional pore zeolite with an intersecting 12/12/ 10-ring channel system: SSZ-33 (similar to CON, 12-ring pores of 6.4 î 7.0 ä and 5.9 î 7.0 ä, 10-ring windows of 5.1 î 4.5 ä). [18] 5) Three-dimensional 10-ring channel zeolite: ZSM-5 (MFI, 5.5 î 5.1 ä and 5.6 î 5.3 ä). The results from hydrocarbon adsorption experiments of these zeolites are shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

SSZ‐53 and SSZ‐59: Two Novel Extra‐Large Pore Zeolites

Burton

Elomari

Chen

et al. 2003

Chemistry A European J

141

106

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The syntheses, structure solutions, and physicochemical and catalytic characterizations of the novel zeolites SSZ-53 and SSZ-59 are described. SSZ-53 and SSZ-59 were synthesized under hydrothermal conditions with the [1-(4-fluorophenyl)cyclopentylmethyl]trimethyl ammonium cation and 1-[1-(4-chlorophenyl)cyclopentylmethyl]-1-methyl azocanium cation, respectively, as structure-directing agents. The framework topology of SSZ-53 was solved with the FOCUS method, and the structure of SSZ-59 was determined by model building. Rietveld refinement of synchrotron X-ray powder diffraction data confirms each proposed model. SSZ-53 and SSZ-59 each possess a one-dimensional channel system delimited by 14-membered rings. Results from transmission electron microscopy, electron diffraction, catalytic experiments (spaciousness index and constraint index tests), and argon and hydrocarbon adsorption experiments are consistent with the proposed structures.

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Section: Resultsmentioning

confidence: 99%

SSZ‐53 and SSZ‐59: Two Novel Extra‐Large Pore Zeolites

Burton

Elomari

Chen

et al. 2003

Chemistry A European J

141

106

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“…4a and b). The pure polytype B was later reported as a borosilicate CIT-1(CON) [20]. The polytype C of the family, where the layers stack without any shifts, was synthesised by Castaneda et al, denoted as ITQ-24 [21].…”

Section: Ssz-26 and Ssz-33 (Con)mentioning

confidence: 99%

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Willhammar¹,

Zou²

2013

Zeitschrift für Kristallographie - Crystalline Materials

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Abstract. Intergrowth and stacking disorders are often found in minerals and synthetic zeolites and inorganic openframeworks. Structure elucidation of stacking disorders in these materials have been difficult and structure solution of stacking disorders in unknown zeolites and open-frameworks has been challenging. There exist no standard methods for structure analysis of such disordered materials. In this review we present various stacking disorders and intergrowth in a number of representative zeolite families containing stacking disorders. These include zeolite beta, SSZ-26/SSZ-33, ITQ-39, ABC-6, ZSM-48, SSZ-31, UTD-1, faujasite FAU/EMT, pentasil ZSM-5/ZSM-11, ITQ-13/ITQ-34, ITQ-22/ITQ-38 etc. Stacking disorders in open-frameworks containing mixed coordinations, including titanosilicates ETS-10 and ETS-4, and the silicogermanate SU-JU-14 are also described. Various crystallographic methods used for solving disordered structures are summarized. The methods include powder X-ray diffraction (PXRD), electron diffraction, high resolution transmission electron microscopy (HRTEM), and single-crystal X-ray diffraction. Examples of model building combined with simulations of PXRD and single crystal X-ray diffraction to verify the structure models are given.

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“…One of the most important novel classes of 3D-interconnected channel structures that has been prepared contains 12-ring channels intersecting with 10-ring channels. The zeolites CIT-1 [45], ITQ-24 [46], and MCM-68 [47] are examples of this type of framework, each prepared with a complex SDA. There is considerable interest in investigating possible novel shape-selective catalytic performances in this type of structure.…”

Section: Novel Structures and Pore Geometriesmentioning

confidence: 99%

Structural Chemistry of Zeolites

Wright

Pearce

2010

Zeolites and Catalysis

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IntroductionZeolites are tetrahedrally connected framework solids, based on silica, with intricate structures that possess channels and cages large enough to contain extra-framework cations and to permit the uptake and desorption of molecules varying from hydrogen to complex organics up to 1 nm in size. Their crystalline structure directly controls their properties and consequently their performance in applications such as ion exchange, separation, and catalysis, and is therefore of great interest to academics and technologists alike. A ''ball and stick'' representation of the most widely used zeolite A, with tetrahedral Al and Si atoms linked by O atoms and with chargebalancing Na + cations, is given in Figure 7.1.Originally discovered as aluminosilicate minerals, synthetic zeolites with a range of compositions are now widely prepared and subsequently modified for a wide range of applications. Many excellent articles, reviews, and books describe the structures of these solids, often in well-illustrated texts [1-3] and online resources [4]. Here we start by summarizing their structural chemistry, beginning with the key features of the best known and most widely used zeolites A and Y. Besides covering the periodic structures of these solids, other features such as secondary mesoporosity are also important to their performance and are discussed. This is followed by a summary of the structural chemistry of some of the important zeolite types prepared using inorganic and simple organic cations prior to the 1990s.Over the last 20 years there has been a major international effort to prepare new zeolitic materials, in the search for improved adsorbents and catalysts. Much of this has focused on the exploration of the use of complex organic alkylammonium ions, synthesized specifically as potential ''templates,'' giving high-silica-content zeolites or pure silica polytypes. The diversity of structures has also been increased by the inclusion of elements other than Al for Si in the framework, which may be either aliovalent (2+ or 3+) or isovalent (4+), and the search for new materials is encouraged by the tantalizing arrays of hypothetical structures that have been shown to be energetically feasible [5,6]. The remarkable products of this ongoing odyssey continue to show new structural features that are both intriguing and of practical importance or potential: increased crystallographic complexity leading to structures with novel

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CIT-1: A New Molecular Sieve with Intersecting Pores Bounded by 10- and 12-Rings

Cited by 142 publications

References 0 publications

SSZ‐53 and SSZ‐59: Two Novel Extra‐Large Pore Zeolites

SSZ‐53 and SSZ‐59: Two Novel Extra‐Large Pore Zeolites

Stacking disorders in zeolites and open-frameworks – structure elucidation and analysis by electron crystallography and X-ray diffraction

Structural Chemistry of Zeolites

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